关于使用C臂光镜系统进行内镜逆行胆血管细胞造影的诊断参考水平数量的基本研究
Hiroki Ishii1,2, Koichi Chida1,3, Yohei Inaba1,3
1Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
概括
由于沙发高度的变化,患者参考点 (K a,r) 上的空气基质量不是适合用于内镜逆行胆血管细胞造影 (ERCP) 的诊断参考水平 (DRL) 量. 克尔马区域产品 (PKA) 是一个更可靠的DRL,用于优化ERCP中的患者保护.
科学领域:
- 医学物理 医学物理
- 辐射保护 辐射保护
- 诊断成像 诊断成像 诊断成像
背景情况:
- 诊断参考水平 (DRL) 对于优化医疗成像过程中的患者保护至关重要.
- 制造商对空气克尔马 (K a,r) 的参考点的各种定义,对DRL的一致应用提出了挑战.
- 内镜逆行胆血管细胞造影 (ERCP) 涉及显著的辐射暴露,需要精确的剂量监测.
研究的目的:
- 评估患者入口参考点 (K a,r) 上的空气克尔玛作为ERCP的DRL量是否合适.
- 根据患者的沙发高度,评估K a,r和患者皮肤表面 (K a,e) 发生的空气克尔玛之间的变化.
- 为了比较K a,r和kerma面积积积的可靠性 (P KA) 作为基于C臂系统的ERCP中的DRL量.
主要方法:
- 采用C臂系统 (Ultimax-i) 和横卧管系统 (CUREVISTA Open) 进行光学和放射学.
- 用幻影的入口表面上的离子室测量了KAe.
- 使用C臂系统内置的P KA计测量P KA和K a,r.
主要成果:
- 随着病人的沙发远离焦点,K a,e下降,而K a,r增加.
- 由于患者沙发高度的变化,观察到K a,e/K a,r比率存在显著的不确定性 (75%-94%).
- 皮卡显示独立于病人的沙发高度,表明其可靠性作为DRL数量.
结论:
- 在ERCP中,K a,r可能无法准确地表示患者的皮肤剂量 (K a,e),原因是C臂系统的沙发高度变化.
- 在ERCP程序中,P KA被推为更强大和可靠的DLR数量.
- 对于ERCP的DRLs不应该仅仅基于K a,r,而不考虑患者的沙发高度,以确保有效的患者剂量优化.
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